From patchwork Mon Oct 14 10:51:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adrian Hunter X-Patchwork-Id: 13834637 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 427C318C32D; Mon, 14 Oct 2024 10:52:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728903174; cv=none; b=MqJZvyAV9Xlac7ARhCa9jpVjMcLLe6PCJwY+pNCBvq+Xhkt2IX4p977mmTwEX+7CfvUs4qQQOZtWoTXulGfqG6zBfcEkyIdi5oOA0Cdm9BSFVDX6tvw1Pu459sOj+eNCq5UJO+OW+IJapxHXNMlDyA/FcOLj0oPPmRJ+XV3axqo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728903174; c=relaxed/simple; bh=Zjgbpan3cZVLGuFFUy8sd/EQgJCOyA0/5DCRph244NI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qr/WsG89eED5NKof/MQK4ds+Sy3JTPF7RtRdYj8k5EnSJcQ7XbLRlzAlTQwLJOclZACnytVrK98hZEQCJP8xZuwKXPwUnRFRJ3fEK9Dt8tojPxFlWJDKxVjxQmgaP19XdqK/ov0/SQ4TjGnLaWTolUr3b4pEwQL5gnTliLlvLh4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=QzHNkMfG; arc=none smtp.client-ip=198.175.65.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="QzHNkMfG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1728903172; x=1760439172; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Zjgbpan3cZVLGuFFUy8sd/EQgJCOyA0/5DCRph244NI=; b=QzHNkMfGaP8kDl88kCCUtTeAwSlXrm4yvkhJ6BGGFWsRnIlQaZjD3k1B FupJIZPrAPEHWQPytYsXzxPOyuNdYc7YGPdP+LTNj9Ap1nu4M3dZQmoTr BmcT/sC+zjoPInv7Gl6Ru0t3zcZ1CdsY65gduO6R3T4tWIFM9x0KBEKBX HrV6lrM1HPf9lGRV65jGkcbVbYr8kuQ6FU/gzIFZWTF7Q95bO3W7YOMCE m4crUST69LMdWgrTD1tbeX4CyAyJDEBZ8WYyNfO5Hv4C1y0kRJjutPwYN mdXmNqJnawDLKBO49GMVuxmQj1ChiWjz5N5ng0Xu+3HDr/zTTo42egvgI Q==; X-CSE-ConnectionGUID: jrNnjVzuRUWQi1L+GrRwGA== X-CSE-MsgGUID: o/uLfg7JRnWX0KnR1e5bEg== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="39366194" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="39366194" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Oct 2024 03:52:51 -0700 X-CSE-ConnectionGUID: 2j8KMAHAQmu6GQuTH6XpFA== X-CSE-MsgGUID: ifLPBn/ySMed+5oFyFNBog== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,202,1725346800"; d="scan'208";a="77727439" Received: from ahunter6-mobl1.ger.corp.intel.com (HELO localhost.localdomain) ([10.245.115.59]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Oct 2024 03:52:41 -0700 From: Adrian Hunter To: Peter Zijlstra , Sean Christopherson , Paolo Bonzini Cc: Ingo Molnar , Mark Rutland , Alexander Shishkin , Heiko Carstens , Thomas Richter , Hendrik Brueckner , Suzuki K Poulose , Mike Leach , James Clark , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, Yicong Yang , Jonathan Cameron , Will Deacon , Arnaldo Carvalho de Melo , Jiri Olsa , Namhyung Kim , Ian Rogers , Andi Kleen , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, H Peter Anvin , Kan Liang , Zhenyu Wang , mizhang@google.com, kvm@vger.kernel.org, Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH V13 06/14] perf/x86/intel/pt: Add support for pause / resume Date: Mon, 14 Oct 2024 13:51:16 +0300 Message-ID: <20241014105124.24473-7-adrian.hunter@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241014105124.24473-1-adrian.hunter@intel.com> References: <20241014105124.24473-1-adrian.hunter@intel.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Prevent tracing to start if aux_paused. Implement support for PERF_EF_PAUSE / PERF_EF_RESUME. When aux_paused, stop tracing. When not aux_paused, only start tracing if it isn't currently meant to be stopped. Signed-off-by: Adrian Hunter Reviewed-by: Andi Kleen --- Changes in V12: Rebase on current tip plus patch set "KVM: x86: Fix Intel PT Host/Guest mode when host tracing" Changes in V9: Add more comments and barriers for resume_allowed and pause_allowed Always use WRITE_ONCE with resume_allowed arch/x86/events/intel/pt.c | 69 ++++++++++++++++++++++++++++++++++++-- arch/x86/events/intel/pt.h | 4 +++ 2 files changed, 70 insertions(+), 3 deletions(-) diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index d9469d2d6aa6..b6cfca251c07 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -418,6 +418,9 @@ static void pt_config_start(struct perf_event *event) struct pt *pt = this_cpu_ptr(&pt_ctx); u64 ctl = event->hw.aux_config; + if (READ_ONCE(event->hw.aux_paused)) + return; + ctl |= RTIT_CTL_TRACEEN; if (READ_ONCE(pt->vmx_on)) perf_aux_output_flag(&pt->handle, PERF_AUX_FLAG_PARTIAL); @@ -539,11 +542,23 @@ static void pt_config(struct perf_event *event) event->hw.aux_config = reg; + /* + * Allow resume before starting so as not to overwrite a value set by a + * PMI. + */ + barrier(); + WRITE_ONCE(pt->resume_allowed, 1); /* Configuration is complete, it is now OK to handle an NMI */ barrier(); WRITE_ONCE(pt->handle_nmi, 1); - + barrier(); pt_config_start(event); + barrier(); + /* + * Allow pause after starting so its pt_config_stop() doesn't race with + * pt_config_start(). + */ + WRITE_ONCE(pt->pause_allowed, 1); } static void pt_config_stop(struct perf_event *event) @@ -1526,6 +1541,7 @@ void intel_pt_interrupt(void) buf = perf_aux_output_begin(&pt->handle, event); if (!buf) { event->hw.state = PERF_HES_STOPPED; + WRITE_ONCE(pt->resume_allowed, 0); return; } @@ -1534,6 +1550,7 @@ void intel_pt_interrupt(void) ret = pt_buffer_reset_markers(buf, &pt->handle); if (ret) { perf_aux_output_end(&pt->handle, 0); + WRITE_ONCE(pt->resume_allowed, 0); return; } @@ -1588,6 +1605,26 @@ static void pt_event_start(struct perf_event *event, int mode) struct pt *pt = this_cpu_ptr(&pt_ctx); struct pt_buffer *buf; + if (mode & PERF_EF_RESUME) { + if (READ_ONCE(pt->resume_allowed)) { + u64 status; + + /* + * Only if the trace is not active and the error and + * stopped bits are clear, is it safe to start, but a + * PMI might have just cleared these, so resume_allowed + * must be checked again also. + */ + rdmsrl(MSR_IA32_RTIT_STATUS, status); + if (!(status & (RTIT_STATUS_TRIGGEREN | + RTIT_STATUS_ERROR | + RTIT_STATUS_STOPPED)) && + READ_ONCE(pt->resume_allowed)) + pt_config_start(event); + } + return; + } + buf = perf_aux_output_begin(&pt->handle, event); if (!buf) goto fail_stop; @@ -1615,6 +1652,12 @@ static void pt_event_stop(struct perf_event *event, int mode) { struct pt *pt = this_cpu_ptr(&pt_ctx); + if (mode & PERF_EF_PAUSE) { + if (READ_ONCE(pt->pause_allowed)) + pt_config_stop(event); + return; + } + /* * Protect against the PMI racing with disabling wrmsr, * see comment in intel_pt_interrupt(). @@ -1622,6 +1665,15 @@ static void pt_event_stop(struct perf_event *event, int mode) WRITE_ONCE(pt->handle_nmi, 0); barrier(); + /* + * Prevent a resume from attempting to restart tracing, or a pause + * during a subsequent start. Do this after clearing handle_nmi so that + * pt_event_snapshot_aux() will not re-allow them. + */ + WRITE_ONCE(pt->pause_allowed, 0); + WRITE_ONCE(pt->resume_allowed, 0); + barrier(); + pt_config_stop(event); if (event->hw.state == PERF_HES_STOPPED) @@ -1787,6 +1839,10 @@ static long pt_event_snapshot_aux(struct perf_event *event, if (WARN_ON_ONCE(!buf->snapshot)) return 0; + /* Prevent pause/resume from attempting to start/stop tracing */ + WRITE_ONCE(pt->pause_allowed, 0); + WRITE_ONCE(pt->resume_allowed, 0); + barrier(); /* * There is no PT interrupt in this mode, so stop the trace and it will * remain stopped while the buffer is copied. @@ -1806,8 +1862,13 @@ static long pt_event_snapshot_aux(struct perf_event *event, * Here, handle_nmi tells us if the tracing was on. * If the tracing was on, restart it. */ - if (READ_ONCE(pt->handle_nmi)) + if (READ_ONCE(pt->handle_nmi)) { + WRITE_ONCE(pt->resume_allowed, 1); + barrier(); pt_config_start(event); + barrier(); + WRITE_ONCE(pt->pause_allowed, 1); + } return ret; } @@ -1923,7 +1984,9 @@ static __init int pt_init(void) if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries)) pt_pmu.pmu.capabilities = PERF_PMU_CAP_AUX_NO_SG; - pt_pmu.pmu.capabilities |= PERF_PMU_CAP_EXCLUSIVE | PERF_PMU_CAP_ITRACE; + pt_pmu.pmu.capabilities |= PERF_PMU_CAP_EXCLUSIVE | + PERF_PMU_CAP_ITRACE | + PERF_PMU_CAP_AUX_PAUSE; pt_pmu.pmu.attr_groups = pt_attr_groups; pt_pmu.pmu.task_ctx_nr = perf_sw_context; pt_pmu.pmu.event_init = pt_event_init; diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h index 0428019b92f4..480a5a311148 100644 --- a/arch/x86/events/intel/pt.h +++ b/arch/x86/events/intel/pt.h @@ -119,6 +119,8 @@ struct pt_filters { * @filters: last configured filters * @handle_nmi: do handle PT PMI on this cpu, there's an active event * @vmx_on: 1 if VMX is ON on this cpu + * @pause_allowed: PERF_EF_PAUSE is allowed to stop tracing + * @resume_allowed: PERF_EF_RESUME is allowed to start tracing * @output_base: cached RTIT_OUTPUT_BASE MSR value * @output_mask: cached RTIT_OUTPUT_MASK MSR value * @status: cached RTIT_STATUS MSR value @@ -132,6 +134,8 @@ struct pt { struct pt_filters filters; int handle_nmi; int vmx_on; + int pause_allowed; + int resume_allowed; u64 output_base; u64 output_mask; u64 status;